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Description: These DC powered heating pads are perfect for near-body heating applications. They get warm to the touch but not too hot. Simply apply 5VDC to the wire leads and within minutes, the pad will begin to warm up.

These heating pads are constructed using a mesh of Polyester filament and Micro Metal Conductive Fiber folded into a protective Polyimide Film. The fact that these are low power, flexible and draw little power makes them ideal for things like hand-warmers and other heated garments. Maybe hook up a microcontroller and some sensors and make your own climate-controlled hoodie?

Dimensions: 5 x 15 cm

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Comments 29 comments

  • I once installed heating pads similar to these under motorcycle grips. They kept my hands nice and toasty when the mercury plunged. I preferred them to pricier integrated heated grips, as I could continue to use whichever grips I liked. This heating pad seems to be about the right size for that application. Attach to the bars with hairspray and add a rheostat to control the temperature. Take power from a circuit that is powered only when the ignition is on (e.g., brake lights), so you won’t drain the battery if you forget to turn off the heating pads. If the bars are hollow, you could run the wires inside.

  • Hey, got a couple questions that I hope some of you can answer. I’m looking to install some of these in clothing, are they washable? Can I run these through a lilypad arduino board and a 5v battery with enough heat generated to feel through fabric? If anyone can answer either one of these questions that would be great, thanks!

    • 5v would not be a sufficient to power an arduino with the heating pad. You would need about 30V to get around 45C. It’s just not feasible to power one pad with 5v

  • Wow, I can’t believe Sparkfun sells this product. Not cool, guys!

    Also, what’s the current draw on this?

  • Would running this through a washing machine cause any problems?

  • I am planning to use these in my gloves, would removing the plastic layers cause any damage? Would there be any danger of directly touching the internal conducting threads to skin when the plastic layers are removed? Thanks!

  • I’m thinking these might work as mirror heaters for my telescope to get rid of condensate. Looks like they might run a little hot though. Maybe hook two in series and run them off a 9v battery with a pot. Shouldn’t be too hard to wrap a couple of these around the primary on the inside of the tube. An arduino might be a little overkill to regulate the temp though.

    • These pads draw 0.7A at 5V. I think a 9V battery would be depleted rather quickly (~1 h).

    • Since these are basically fixed resistors, and thus subject to Ohm’s law, you can regulate their temperature by reducing the input voltage, or chopping the input (PWM or more simply, turn it on until it reaches your desired temperature, turn it off, repeat).

      You could reduce the input voltage from your main supply (12V car battery?) with an adjustable regulator such as the LM317. This won’t be hugely efficient, as the regulator will get hot itself, but it’s easy to do.

      Good luck on your project and let us know how it goes!

  • I found the WireKinetics ‘Web site here:

    [http://www.wirekinetics.com/en/products.php]

    I looked around, but could not find a datasheet for these products; if they have one, it’s apparently not available to the general public.

    Is there any way of obtaining one, or at least getting a plot of current vs. expected temperature?

    Thanks…

    • These pads will draw 0.7A at 5v for 3.5 watts and about 7.14 ohms. At these ratings with a 23C ambient temp, this pad will reach ~70C. I cant remember exactly what the equation, but the temp is proportional to the power input minus the power dissipation, which is exponential/related to the surface area of the pad and the ambient temp/heat resistance of the surrounding medium. if you can get these variables and find the equation (try something like “calculating power dissipation” on Google), you should be able to get data-points for current (and because this is restive, voltage)/ temp at at specific ambient temperatures to air.

  • I am thinking about using two of these to warm a solar battery bank in an insulated box. I live in Michigan and my battery bank is in a detached garage where temp can drop below freezing quite often. I have a DC charge controller and am thinking about wiring two of these pads off the 3V DC port. The controller has direct DC outputs and should recharge the less than amp draw. Any thoughts? I am also looking for a dc temp controller to automatically monitor the temp so I am not drawing power unless needed. I am not sure if this type of temp controller for dc exists. Any help is appreciated.

    • You can use a Microcontroller, temp sensor, and a MOSFET as the temp controller. You can use a simple Proportional control in your microcontroller code.

  • Could we get a measurement on the weight and resistance of this product?

  • The first thing that came to mind for me was heated seats in my car. Just peel back the fabric and tape these things down. My question is whether these could hold up to both the direct pressure and the rubbing involved. Could I get an answer to how durable these things are? Thanks.

  • How exactly do these work? I’m trying to figure out if I could create a temperature control using a variable resistor. Do these generate heat through resistance, or some other method?

    • They work through resistance, yes. So you should be able to vary temperature using a resistor, supplying a lower/higher voltage, or even PWM.

  • is it possible to waterproof this heater?

  • Can someone tell me at what temperature the pad is irreversible damaged? (like in the video?)

    Thanks!

  • Can someone please measure the resistance of the heating pad? That way I and everyone else can calculate the current and wattage at various voltages. The ‘warmup profile’ is interesting but can’t really be used to figure out how it’ll behave in different applications. The video gives a coarse way of calculating the resistance by stating the current draw at 5v… but I’d rather just know the specs of this thing.

  • I’m wondering how well this would work as a heating element for a RepRap build platform. Are they available (anywhere) in larger sizes? Say 20x20cm?

    • I did order two of them to try that on my Huxley so I hope they work. But I get the feeling they might not be good enough for abs. But I am sure 80c is better than no heated bed.

  • My thought on these is to use as a Lipo battery warmer for my weather station on the roof in the winter time.

  • “The fact that these are low power, flexible and draw little power makes them ideal for things like hand-warmers and other heated garments. Maybe hook up a microcontroller and some sensors and make your own climate-controlled hoodie?”

    NO!…you mean: “these are great to keep your electronics warm on your HAB proyects… or Higher.”


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